Magnetoelectric multiferroics have been recently the focus of a significant research effort. The experiment that we propose explores a new class of "magnetochiral" systems, along the lines of our recent succesful experimental work on Fe-langasite. MnSb2O6 is an example of a material developing a non-collinear incommensurate magnetic order on a chiral crystallographic structure; the combination of the two may give rise to strong coupling between the structural and the magnetic chirality, as is the case in Fe-langasite, opening the possibility of significant magneto-electric effects in a spontaneous mono-domain magnetic system. We propose to investigate the peculiar features of this compound by analysing its complex magnetic structure, which hitherto has not been unambiguously determined, via magnetic neutron diffraction measurements on powder samples.